ch/design tweaks

[ccchwang]

Created new branch because merging/rebasing got messed up on original branch #459 (ch/design-tweak-test).

[codecov-io]

Codecov Report

Merging #461 into master will increase coverage by 0.51%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #461      +/-   ##
=========================================
+ Coverage   93.19%   93.7%   +0.51%     
=========================================
  Files          29      29              
  Lines        1029    1033       +4     
  Branches      197     195       -2     
=========================================
+ Hits          959     968       +9     
+ Misses         59      55       -4     
+ Partials       11      10       -1

Impacted Files	Coverage Δ
packages/microcosm/src/key-path.js	78.57% <0%> (-7.15%)	⬇️
packages/microcosm/src/domain-engine.js	80.88% <0%> (-1.48%)	⬇️
packages/microcosm/src/utils.js	97.26% <0%> (-1.37%)	⬇️
packages/microcosm/src/action.js	95.72% <0%> (-0.86%)	⬇️
packages/microcosm/src/addons/indexing.js
packages/microcosm/src/addons/action-form.js	97.61% <0%> (ø)
packages/microcosm/src/microcosm.js	93.39% <0%> (+0.94%)	⬆️
packages/microcosm/src/history.js	87.87% <0%> (+3.03%)	⬆️
packages/microcosm/src/effect-engine.js	100% <0%> (+11.11%)	⬆️
packages/microcosm/src/addons/action-queue.js	100% <0%> (+20%)	⬆️

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